package com.lagou.rpc.consumer.proxy;

import com.alibaba.fastjson.JSON;
import com.lagou.rpc.common.RpcRequest;
import com.lagou.rpc.common.RpcResponse;
import com.lagou.rpc.consumer.client.RpcClient;

import java.lang.reflect.Proxy;
import java.util.UUID;

/**
 * 客户端代理类-创建代理对象
 * 1.封装request请求对象
 * 2.创建RpcClient对象
 * 3.发送消息
 * 4.返回结果
 */
public class RpcClientProxy {

    /**
     * 调整获取ip的地方。
     */
    static RpcClient[] ips = new RpcClient[]{
            new RpcClient("127.0.0.1", 8899),
            new RpcClient("127.0.0.1", 8888)
    };
    static int count = 0;

    public static Object createProxy(Class serviceClass) {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class[]{serviceClass}, (proxy, method, args) -> {
                    //1.封装request请求对象
                    RpcRequest rpcRequest = new RpcRequest();
                    rpcRequest.setRequestId(UUID.randomUUID().toString());
                    rpcRequest.setClassName(method.getDeclaringClass().getName());
                    rpcRequest.setMethodName(method.getName());
                    rpcRequest.setParameterTypes(method.getParameterTypes());
                    rpcRequest.setParameters(args);
                    //2.创建RpcClient对象
                    RpcClient rpcClient = getRpcClient();
                    try {
                        //3.发送消息
                        Object responseMsg = rpcClient.send(JSON.toJSONString(rpcRequest));
                        RpcResponse rpcResponse = JSON.parseObject(responseMsg.toString(), RpcResponse.class);
                        if (rpcResponse.getError() != null) {
                            throw new RuntimeException(rpcResponse.getError());
                        }
                        //4.返回结果
                        Object result = rpcResponse.getResult();
                        return JSON.parseObject(result.toString(), method.getReturnType());
                    } catch (Exception e) {
                        throw e;
                    }

                });
    }

    /**
     * 根据每次调用，进行计数
     */
    private static RpcClient getRpcClient() {
        if (count < 1) {
            count++;
        } else {
            count = 0;
        }
        RpcClient ip = ips[count];
        System.out.println(ip);
        return ips[count];
    }
}
